/* ===================================
   Global Styles & CSS Variables
   =================================== */

:root {
    --primary-color: #1a3a52;
    --secondary-color: #2d5a7b;
    --accent-color: #4a90e2;
    --light-accent: #e8f1f8;
    --text-dark: #2c3e50;
    --text-light: #5a6c7d;
    --text-muted: #8b95a5;
    --border-color: #d4dce6;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --error-color: #e74c3c;
    
    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-secondary: 'Georgia', 'Garamond', serif;
    
    --transition: all 0.3s ease;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

/* ===================================
   Reset & Base Styles
   =================================== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    background-color: var(--bg-white);
    line-height: 1.6;
    letter-spacing: 0.3px;
}

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-secondary);
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

h1 {
    font-size: 2.5rem;
    letter-spacing: -0.5px;
}

h2 {
    font-size: 2rem;
    margin-top: 2rem;
    border-bottom: 3px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1.5rem;
    color: var(--text-dark);
    text-align: justify;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* ===================================
   Navigation Bar
   =================================== */

.navbar {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo a {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--bg-white);
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9);
    font-weight: 500;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--light-accent);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 0;
    width: 100%;
    height: 3px;
    background-color: var(--accent-color);
    border-radius: 2px;
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--bg-white);
    padding: 6rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(74, 144, 226, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(74, 144, 226, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--bg-white);
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero p {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 0;
}

/* ===================================
   Main Container
   =================================== */

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 3rem 2rem;
}

/* ===================================
   Blog Article Styles
   =================================== */

.blog-article {
    background-color: var(--bg-white);
}

.article-header {
    margin-bottom: 3rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 2rem;
}

.article-header h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.article-meta {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.publish-date {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.article-content {
    line-height: 1.8;
}

.article-content h2 {
    margin-top: 2.5rem;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

.article-content p {
    margin-bottom: 1.8rem;
    color: var(--text-dark);
    text-align: justify;
}

.article-content a {
    color: var(--accent-color);
    font-weight: 600;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
}

.article-content a:hover {
    border-bottom-color: var(--accent-color);
    color: var(--secondary-color);
}

/* ===================================
   Footer
   =================================== */

.footer {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--bg-white);
    padding: 3rem 2rem 1rem;
    margin-top: 4rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3 {
    color: var(--light-accent);
    margin-bottom: 1rem;
    font-size: 1.1rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 0.5rem;
    text-align: left;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.85);
    transition: var(--transition);
}

.footer-section a:hover {
    color: var(--light-accent);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.75);
    font-size: 0.9rem;
}

/* ===================================
   Form Styles
   =================================== */

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-dark);
}

input[type="text"],
input[type="email"],
input[type="phone"],
input[type="date"],
textarea,
select {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--bg-white);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="phone"]:focus,
input[type="date"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

textarea {
    resize: vertical;
    min-height: 150px;
}

button {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--secondary-color) 100%);
    color: var(--bg-white);
    padding: 0.75rem 2rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

button:active {
    transform: translateY(0);
}

/* ===================================
   Utility Classes
   =================================== */

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mt-4 { margin-top: 2rem; }

.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.mb-4 { margin-bottom: 2rem; }

.pt-1 { padding-top: 0.5rem; }
.pt-2 { padding-top: 1rem; }
.pt-3 { padding-top: 1.5rem; }
.pt-4 { padding-top: 2rem; }

.pb-1 { padding-bottom: 0.5rem; }
.pb-2 { padding-bottom: 1rem; }
.pb-3 { padding-bottom: 1.5rem; }
.pb-4 { padding-bottom: 2rem; }

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.5rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-menu {
        gap: 1rem;
        font-size: 0.9rem;
    }

    .nav-logo a {
        font-size: 1.4rem;
    }

    .container {
        padding: 2rem 1rem;
    }

    .article-header h1 {
        font-size: 2rem;
    }

    .article-meta {
        gap: 1rem;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }

    .footer-section {
        text-align: center;
    }

    .footer-section p,
    .footer-section a {
        text-align: center;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    h1 {
        font-size: 1.5rem;
    }

    h2 {
        font-size: 1.25rem;
    }

    .hero {
        padding: 3rem 1rem;
    }

    .hero h1 {
        font-size: 1.5rem;
    }

    .hero p {
        font-size: 0.95rem;
    }

    .nav-menu {
        gap: 0.5rem;
        font-size: 0.8rem;
    }

    .nav-logo a {
        font-size: 1.2rem;
    }

    .article-header h1 {
        font-size: 1.5rem;
    }

    .article-content p {
        text-align: left;
    }

    p {
        text-align: left;
    }

    button {
        width: 100%;
    }
}

/* ===================================
   Print Styles
   =================================== */

@media print {
    .navbar,
    .footer {
        display: none;
    }

    body {
        background-color: var(--bg-white);
    }

    a {
        color: var(--text-dark);
    }
}